Devices for I2C bus communication

The Inter-integrated Circuit (I2C) Protocol is a protocol intended to allow multiple “slave” digital integrated circuits (“chips”) to communicate with one or more “master” chips. Like the Serial Peripheral Interface (SPI), it is only intended for short distance communications within a single device. Like Asynchronous Serial Interfaces (such as RS-232 or UARTs), it only requires two signal wires to exchange information.

A wide range of low-cost integrated devices have become available - that can be simply interfaced to micro controllers via the I2C protocol. These devices provide useful functions for a wide range of applications. XOD provides a library of nodes with low level functions ( that can be used to create custom interfaces for these devices. Additional documentation for XOD can be found at

Update: Check out Victor Nakoryakov’s guide to I2C communication basics at: (13Dec2018)

Sparkfun guide to I2C communication protocol:

I2C communication basics:

I2C primer:

Seeed Studio wiki Arduino Software I2C user guide:


I2C modules